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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e56c64bf87dc9c359f06b5e33574626df08ff50b0b6043fdb641b3ce586a54e' 
  AND token = 'AhFoi/c3DsreydXoymb9+uGnZKlliqy4ouImJurpxMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}